Lens-fastening.



F. H. KAHN.

LENS FASTENING.

APPLICATION FILED DEC. 9, 1914.

1, 1 32,945. Patented mp2s, 1915.

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arsenic,

To all whom it may concern:

Be it known that l, FERNANDO H. Kama, a citizen'of'the United States, and resident of San Francisco, in the county of San Francisco and State of California, have in .vented certain new and useful Improvements in Lens-Fastenings, of which the following is a specification.

Thisinvention relates to lens fastenings and. my improvement is directed particularly to a means of rigid connection between-lens-and mount which is not dependent upondegree of tensional grip for the security of tie union effected.

With the usual form of lens" mount fastenings, as where the strap portions are united by a screw passed through the lens, loosenmg thereof occurs as the lens w'orks upon said screw, involving considerable annoyance to the wearer from the frequent occa; sion to tighten the screw; besides causing variation in v the adjustment of the lens, detrimental to the users field of vision.

llhe main pre-requisite for the connection between a lens and its mount is that by its means said elements shall become so interconnectingly engaged as to be a practically homogeneous structure, and thus inca able of disengagement or loosening at the oint.

l the like.

With this object in View, my invention consists of a mount having strapportions to lie against opposite sides of a lens, inclosing a slot extending longitudinally within the lens, the said mount havin a rigid tongue lyin between the straps wlthin the slot in the ens, and cement or other plastic adherent. or hardening substance, molded between the tongue and the slot, to securely bind and thus anchor the mount to the lens.

The lens slot may be enlarged inwardly, and the tongue may have an enlarged portion to lie within said slot enlargement, so that when provided'with the cement filling or the like embedding the tongue and looking its enlargement as ina cast, withdrawal and oscillation are positively prevented.

The tongue of the mount, which is in the form of a web between the two strap portions, may be separated from one of said strap able t e strapsto accommodate lenses of varying thickness, Within certain limits, or of varying surface contour, and to provide space for inward bending of one of said ortions by a clearance space, to en-x v mm, on can mnoisco, canronnm,

Lens-resume.

Patented Mar. as, rare.

Application filed December 9, 191a Serial No. 876,206.

strap portions into close contact with the adjacent lens surface. I Other features and advantages will heremafter appear.

in the drawing: Figure 1 is-a partial plan new of a lens with mount attached. Fig.

2 is an enlarlged section through the lens and mount. ig. 3 is a cross section on the line 3-3 of Fig. 2. Fig. i is a perspective view of the-mount, and Fig. 5 1s a detail view of a modification.

In carrying out my invention, a lens, as 1, has a slot 2 extending therein from one end in the form of a longitudinal notch, of sufiicient depth to receive a tongue or key 3 extending from a mount 4 provided with strap portions 5, 6; The slot 2 may have an enlargement 7, and the tongue 3 may have an enlarged'terminal portion 8, to lie within said enlargement 7; whereby, when a filling oiicement or the like is provided for the slot 2 and its enlargement, the tongue aforesaid becomes securely bound therein, the cement I within the slot, because the mass of the ocment is provided with a head portion with in enlargement 7, while the enlarged terminal portion 8 of thetongue is similarly locked, by embedment within the cement or The strap, portions 5 and 6 .respectively lie over the op osite sides of slot 2, in contact with the ens surfaces about the slot edges, but said strap portions do not exercise tensional pressure upon the lens,

merely servingas inclosing side walls for the cement filling, and for laterally localizing the-amount upon the lens.

A clearance, as 'at 9, may be left between the tongue 3 and one of the strap portions, as 5, permitting the latter to be bent in- "wardly upon a lens surface that fails to fill out the full space between the straps. in this way varying thicknesses and surface contours of lenses mav be accommodated between the straps, while permitting the latten to lie snugly upon the lens surfaces.

But it must be particularly noted that the lens straps exert no binding or securing tension upon the lens, which is, under the system of mount connection herein shown, subject to no bearing strains whatsoever.

in practice the slot 2 is tilled with cement or other suitable plastic adherent or hardensubstance, igiie meme is em piece"; in pesiiien *zhe imagine 8 embedeieci eheieiie end. the steep pereiens severing the siei; m; the lens sides whei eiiyt, upen eerdeiiing ef the cement er the-L ke the lens and meimfz become umifieei a iiemegeneeiis seliei, Without pxeseure strain ex" ether liability e1? weakening ieiis new Pflim'i; efi eemieeeiem-w me mediiieei 01m of the meuii'i, es in 5 the enlargement ef the iengue be in eyiincii'icei feime, emeliy pierced and! ishzceededz, eed eiie pert-imi- I 1' EEEGSIE said tongue may have an eiiiiefi. orifice 1% recepi'zieii e1? screw 1%; be lElli'ili'IiGK eezenect eeiii steep portion and ieiigue.

Veiiii031s may be resereeci m scope ef my invention, and pembieme (chereef 1 W310 w, T

mineiic eiiiees, I c

1. eemiiinatien with e heviiice diiiei e ict ef e meant with f-eici e embi'eeiiig' said lens fie iiieieee eei e105) teng ue extending 5mm meiim:

mm sale we sale tongue Lyme bee-Wee; eeie el'pmp pertiens, 'W1'1L,Q w 'erveiiiiig;

clearance, and e hardening substance we uniie said tongue and lens within saiei ei-e'i 2. eembina-eien with ieie 1: ieegizsudiiiei sioz with an iliile? e c, meimic with stamp pertieiie em brecim" iiiciese eeideiee e c T301111 said mount me said pertieii Lte iie iii said iaigemeet said eiee CiQZE'J'QKlQ3 ene'i said lzeiigiie email iene The cembinetieii with ieii flengieue inei siei; wien em. e of meumwich st? per-tines; ei eeie. ieiie be iieclese eeie; sieic, z, nested be and i'rem sL into said siee eniargeei iie iii eiet eeieegemenc, Beetw strep pmilim'is, 'Wii an interve mice, eiie 01 said st. see and sei lergemen; having aimed threefi erii: screw engaged in eiificee c said steep and iteiigee, and e t stance unilhe said tenglie end. w

eie'i.

eembineiien iengiem K331i $10; with an inner ef meene per' sieiie e I u I 'a v I" 4 he iii em siec emergemenQ e pe 253mm en mien-em 22110, of said. sires and Salt iergement having ehieae screw engage said emu L P believe 3. like. i: 

